<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <div id="app" >
        <h1>点击了{{count}}次</h1>
        <button v-on:click="count++">+</button>
        <button @click="preClick()">-</button>
    </div>
</body>
<script src="../js/http_cdn.bootcdn.net_ajax_libs_vue_2.6.6_vue.js"></script>
<script>
    new Vue({
        el: "#app",
        data: {
            count: 0,
        },
        methods: {
            preClick() {
                this.count--;
            }
        },
    })

</script>

</html>
